The Emerald Forge - Manda Benson - Bog

There are such things as monsters, but slaying them is little use when the factory keeps sending more.
When Dana is troubled by disturbing dreams about a girl imprisoned in a nightmarish hospital, and a boy from school who seems to know far too much about the past starts following her, it's just two more problems on top of many.
Then she's attacked by a bizarre construct, half beast, half machine, and the puzzle she's being drawn into starts to bear an uncanny resemblance to her own origins...